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(NoModel.) J H ELWARD,

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UNITED STATES JOHN H. ELWARD, OF POLO,

PATENT OFFICE.

ILLINOIS, ASSIGNOR TO MARY ELWARD, OF SAME PLACE. l

BED-PLATE FOR STEAM-ENGINES.

SPECIFICATION forming 4part of Letters Patent No. 279,924, dated dune26, 1883.

Application filed October 31, 1882.

To all whom it may concern:

Be it known that I, JOHN H. ELWAED, a citizen of the United States,residing at Polo, in the county of Ogle and State of Illinois, haveinvented certain new and useful Improvements in Bed-PlatesV forSteam-Engines, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to improvements in bed plate or frame forsupporting the engine upon the boiler, it being especially applicable tothe devices of this class intended to be used on portable engines. rIheimproved bed-plate or supporting-frame which I have devised may also beused to provide a chamber in which the feed-water can be heated beforeit enters the. boiler.

In the drawings, Figure l is a side elevation of the heater and ofenough of the other parts of y an engine to clearly illustrate themethod of applying it, and Fig. 2 is a vertical section.

It is' well known to builders of this class of aengines that theexpansion of the bed-plate or frame-work upon which the cylinder and theengine-shaft are mounted varies with different conditions of thetemperaturev to which the engine is subjected, because this differentcondition affects the temperature to which the bedplate will be heated.Thus the distance between the steam-ports into the cylinder and theeccentric on the engine-shaft is increased or diminishedaccording to thestate of the weather, the result being a variation in the opening andclosing of the ports by the valve, and, as a necessary consequence, anirregularity in the operation of the engine. In order to obviate thisdifficulty, I form the bed-plate or framework upon which the enginerests in two lon- (No model.)

about a right angle to each other, and provided with a bracket, q,adapted to be bolted to the boiler, and having, also, a third wall orplate, Q2, projecting at right angles to the plate Q. R R are twocorresponding walls or plates, formed, preferably, in one piece, and atabout a right angle to each other. The edges of the plates Q Q may begro'oved, as at g q', and the opposing edges of the plates R R may bebeveled to correspond with and fit therein, where they are secured byscrew-bolts r r, or otherwise. The plate R may be grooved, as at r. Theedge of the plate Q2 may be beveled, so as to form, practically, asteam-tight -joint therewith. By preference I insert strips of rubber orother suitable packing material in all the joints, as indicated at r2.By means of these parts and suitable heads, S S, secured to the endsthereof, this frame constitutes a heater through which the exhaust-steamand the feed-water pass, the plates Q2 forming a diaphragm or partitionthroughout the entire length of the heater, except that at one endprovision is made for permitting the steam to pass through or aroundthis plate, and also for the introduction of the feed-Water pipes 'I.

Vhat 'I claim is- 1. The herein-described frame or support for theengine, consisting of the inner section bolted to the boiler and theouter section adapted to be bolted to the inner section, and cast withthe cylinder, the steam-chest, and the guides, substantially as setforth.

2. The herein-described frame or support for the engine, consisting ofthe inner section bolted to the boiler and the outer section adapted tobe bolted to the inner, and cast with the cylinder, the steam-chest, andthe pillow-block of the main shaft, substantially as set forth.

3. The herein-described support for the engine, composed of the plates QQ', cast in one piece, and plates It R, cast in one piece, together withthe cylinder and the steam-chest, and bolted to said part Q Q,substantially as set forth.

In testimony whereof I aiiX my signature in presence of two witnesses.

JOHN H. ELWARD.

Vitnesses:

H. H. BLIss, M. P. OALLAN,

